JPS6050204A - Metal-ceramics bonded body and its manufacturing process - Google Patents

Abstract

PURPOSE:To dispense with any highly accurate machining for a fitting part as well as to make a manufacturing process ever so easy, by fitting a convex part of a ceramic turbine wheel into a concave part of a metallic rotary shaft in a way of making up some play between them. CONSTITUTION:A convex part 14 installed in a tip end of a rotary shaft 11 to be solidly formed with a ceramic turbine wheel 16 is fitted in a concave part 13 installed in a tip end of a metallic rotary shaft 12 in a way of making up some play between them, thus a turbine rotor is formed. With this constitution, a dimensional difference in time of fitting operation is well absorbed by plastic or elastic deformations in the concave part whereby a thermal expansion differential is as well absorbed by a clearance 15. Accordingly, highly machining accuracy in the fitting part is no longer required.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal-ceramic bonded body in which gold F4 and ceramics are bonded by mechanical means, and a method for manufacturing the same.

Ceramics such as zirconia, silicon nitride, and silicon carbide have excellent mechanical strength, heat resistance, and wear resistance.
It is attracting attention as a high-temperature structural material or wear-resistant material for gas turbine engine parts, engine parts, etc. However, since ceramics are generally hard and brittle, their moldability is inferior to that of metal materials. In addition, since it has poor toughness, it has low resistance to impact forces. For this reason, it is difficult to form mechanical parts such as engine parts only from ceramic materials, and they are generally used in the form of a composite structure in which metal members and ceramic members are combined.

A shrink fit structure (including a cold tight fit structure) is known as a mechanical connection structure between a metal member and a ceramic member of a metal/ceramic composite used as an engine part. An example of such a joint structure of a metal/ceramic composite body is a joint structure of a heat-insulating engine piston consisting of a metal piston body and a ceramic piston crown, in which a metal ring is baked around the ceramic piston crown. A structure in which the piston body is cast around the metal ring (Japanese Patent Laid-Open No. 56-12
(No. 2659), or as a coupling structure of a tappet whose sliding surface with the cam is made of ceramic, there is a structure in which a ceramic member is shrink-fitted to the sliding surface of a cast iron tappet with the cam (Wo 82101084). . However, shrink fit structures (including cold fit) have the following drawbacks.

(1) High precision is required in processing the joining members. In other words, the shrink-fit structure heats or cools one of the joining members to create a dimensional difference between the two members that allows them to fit together, and then uses that dimensional difference to fit the two members together. Therefore, the dimensional difference at the shrink fit temperature and the interference after shrink fit (4) are determined by the processing accuracy of both parts. If the machining accuracy is poor, variations in dimensional difference and interference at the shrink fit temperature will increase, not only will stable shrink fit not be possible, but the bonding force of the shrink fit will also become inconsistent.

(2) Parts with small dimensions cannot be joined. That is,
The amount of thermal expansion of the shrink-fit member at the shrink-fit temperature is proportional to the member dimensions. In order to create a fitable dimensional difference for small sized members, the shrink fit temperature must be increased. A high shrink fit temperature is undesirable because it may cause changes in the metal structure, phase transformation, or softening of the metal member, or the temperature difference between the metal member and the ceramic member may become too large, causing thermal shock fracture in the ceramic member. . For this reason, there are restrictions on the dimensions that can be shrink-fitted.

An object of the present invention is to provide a metal-ceramic bonded body with a new bonded structure that does not require high accuracy in processing the bonded members and is not limited by the dimensions of the bonded members, and a method for manufacturing the same.

The present invention provides a metal-ceramic bonded body in which a convex portion provided in a ceramic member is press-fitted into a hole provided in a metal member. It is a metal-ceramic bonded body that is bonded so that a gap exists between the end faces of the four parts and the bottom surface of the convex part of the ceramic member. The diameter of the convex portion provided on the member is 0.05% to 5% larger than the inner diameter of the four parts provided on the metal member, and the convex portion relative to the concave portion is set at a temperature below the annealing temperature of the metal member and at room temperature or during bonding. A method for manufacturing a metal-ceramic bonded body in which the parts are press-fitted at a temperature above the maximum temperature DJ exposed to during use, and a method for integrally bonding a metal member and a ceramic member. The diameter of the protrusion provided is 0.05% or more than the inner diameter of the four parts provided on the metal member.
5% larger, and press-fit the convex part into the concave part at a temperature below the annealing temperature of the metal member and at room temperature or above the maximum operating temperature to which the joint part is exposed during use, and finish it to the specified dimensions after press-fitting. This is a method of manufacturing a metal-ceramic bonded body in which part or all of the surface of a metal member is hardened by carburizing, nitriding, surface hardening, or plating.

Press-fitting here refers to fitting a convex portion provided on a ceramic member by forcibly pushing the four portions provided on a metal member having a smaller diameter than the convex portion diameter by applying a load.

The metal-ceramic bonded body of the present invention is obtained by forcibly pushing convex portions provided on the ceramic member into the four portions provided on the metal member and having a larger diameter than the four portions on the metal member. In this case, the shape, dimensions, wall thickness, etc. of the four parts of the metal member are determined so that the dimensional difference between the convex part of the ceramic member and the four parts of the metal member is absorbed by the plastic and elastic deformation of the metal member. Therefore, the finishing dimensional tolerances of the four parts of the press-fit part and the convex part do not need to be strict.

The dimensional difference between the convex part of the ceramic member and the four parts of the metal member during press-fitting is preferably such that the diameter of the convex part is 0.05% to 5% larger than the inner diameter of the concave part, depending on the amount of deformation of the metal member and the load required for press-fitting. It is particularly preferable to increase it by 0.05(7)% to 1% in order to reduce the difference. If this dimensional difference is less than 0.05%, the bonding force of the press-fitted portion will be insufficient and the bonded portion will come off during use, which is not preferable. If the dimensional difference is 5% or more, the load required for press-fitting becomes too large and the convex portion of the ceramic member may break during press-fitting, which is not preferable.

Press-fitting may be performed at room temperature, or may be performed by heating the metal member or by heating both the metal member and the ceramic member. The heating temperature is preferably below the annealing temperature of the metal member and above the maximum temperature to which the joint is exposed during use. If the press-fitting temperature is higher than the annealing temperature of the metal member, it is not preferable because the internal stress and strain generated in the four parts of the metal member due to press-fitting will be alleviated, and the bonding force of the press-fitted portion will be reduced. Further, when press-fitting is performed by heating both the metal member and the ceramic member, it is not preferable to perform the press-fitting at a temperature below the operating temperature because the bonding force of the press-fitting portion will decrease due to the temperature increase during use.

In the metal/ceramic composite of the present invention, it is necessary that four parts of the metal member (8) deform when the metal member and the ceramic member are press-fitted. For this reason, it is desirable to use the metal member after annealing. When using the hardened metal part side, it is necessary to have a size and shape that allow the four parts of the metal member to be deformed.

If wear resistance is required for metal parts after press-fitting,
The entire surface or a portion of the surface of a metal member is hardened by carburizing, nitriding, surface hardening, plating, or other methods. The surface of the metal member may be hardened before press-fitting.

The present invention will be explained in more detail with reference to the drawings.

FIGS. 1 and 2 show the structure of a specific example of the metal-ceramic composite of the present invention.

Fig. 1 is a longitudinal cross-sectional view of the metal-ceramic composite when the protrusion 4 provided on the ceramic member 1 is forcibly fitted into the 4th part 3 provided on the metal member 2, and Fig. 2 shows the operating temperature. , the bottom surface 7 of the convex portion 4 on the mixed mix member
FIG. 3 is a vertical cross-sectional view of a press-fitted part of a metal-ceramic bonded body when the metal-ceramic bonded body is press-fitted with strong constraints so that a gap 5 exists between the end face 6 of the four parts 8 on the metal member. In order to facilitate press-fitting of both parts, the tip of the convex part on the ceramic member,
The four-part inlet on the metal member may be tapered.

It is desirable that the coefficients of thermal expansion of the metal and ceramic constituting the metal-ceramic composite of the present invention are equal. However, the coefficient of thermal expansion of metals is generally larger than that of ceramics. Therefore, at room temperature, the bottom surface 7 of the convex portion 4 of the ceramic member and the end surface 6 of the four parts 3 of the metal member
If there is no gap between them, when the temperature of the press-fit portion increases, the ceramic member will be damaged due to the difference in thermal expansion between the metal member and the ceramic member. To avoid this,
In the metal-ceramic composite of the present invention, a gap 5 is provided.

In the present invention, between this gap there is an object that can be substantially deformed by stress caused by the difference in thermal expansion between the ceramic member and the metal member, such as an elastic body or a beam generated by finishing processing of the metal member after press-fitting. It is also assumed that there is a gap. The size of the gap 5 may be any size that satisfies the following relationship.

(Size of gap 5)〉(Thermal expansion difference between metal member and ceramic member) x (Press-in distance x Maximum operating humidity) This gap should be filled with a spacer or press-fitted at a temperature higher than the maximum operating temperature of the press-fit part. It is obtained by

FIG. 2 shows a metal-ceramic bond formed by press-fitting a convex portion 4 of a ceramic member 1 into a four-part 8 of a cylindrical metal member 2, which has seven rung portions 9 with a diameter larger than the diameter of the body at one end of the body. This is an example of a body structure. With this flange 9, when another metal member is assembled into the body of the metal member of the metal-ceramic composite of the present invention and tightened with the screw 8 provided at the end of the body, the problem that occurs due to tightening of the screw. Stress due to axial force or the difference in thermal expansion between the body of the metal-ceramic composite body of the present invention and the other metal members assembled on the body is prevented from acting on the ceramic member.

FIG. 8 shows that a convex portion 14 provided at the tip of a rotating shaft 11 that is integrally formed with a ceramic turbine wheel 16 is press-fitted into a four-part portion 13 provided at the tip of a steel rotating shaft 12 on the compressor wheel side. 1 is a turbocharger rotor showing a specific example of the metal-ceramic composite of the present invention.

A gap 15 is provided to prevent the ceramic from being damaged due to the difference in thermal expansion between the metal and the ceramic in the press-fitted part. In addition, when tightening the bearing built into the shaft on the compressor wheel side and the combustor wheel (both not shown) with a nut, the axial force acting on the shaft and the heat generated between the aluminum alloy compressor wheel and the steel shaft 12 A flange 17 is provided so that stress due to differential expansion does not act on the ceramic rotating shaft.

Figures 4, 5, and 6 show a metal-ceramic composite formed by press-fitting a protrusion 4 of a ceramic member with a larger diameter than the through-hole into a through-hole 3 provided in a metal member 2. This is a piston and a tappet for an adiabatic engine showing an application example of the metal/(12) ceramic composite of the present invention, which is connected to another metal member using two screws provided on the outer periphery of the body.

FIG. 4 shows that a hollow space consisting of a partial through hole into which the metal-ceramic combined body of the present invention can be fitted is provided in a part of the piston crown 19 of a metal piston, and the metal-ceramic combined body is fitted into this hollow space. , screw 19 provided in the through hole
This is an insulated engine piston in which the piston crown, which is fixed by A and two screws provided on the metal/ceramic combination, is made of ceramic, and the piston body is made of metal.

FIG. 5 shows that a cavity is provided in the sliding contact surface of the metal tappet 20 with the cam, into which the metal-ceramic composite of the present invention can be fitted, and the metal-ceramic composite of the present invention is fitted into the cavity. The sliding surface 21 between the screw 2OA provided in-house and the cam fixed by two screws provided on the metal-ceramic combination is a tappet made of ceramic.

FIG. 6 shows that a through hole into which the metal/ceramic composite of the present invention can be fitted is provided on the sliding surface of the metal tappet 28 with the cam, and the metal/ceramic composite of the present invention is fitted into the through hole and the metal/ceramic composite of the present invention is inserted into the through hole. It was fixed with a screw 28A provided in the hole and two screws provided on the outer periphery of the metal/ceramic composite.
The sliding surface 21 with the cam and the bushing rod contact surface 22 are tappets made of ceramics.

The ceramic material constituting the metal-ceramic composite of the present invention may be selected from silicon nitride, silicon carbide, partially stabilized zirconia, alumina, beryllia, etc. depending on the intended use of the metal-ceramic composite of the present invention. . For example, when making a turbocharger rotor using the metal-ceramic composite of the present invention, it is desirable to use silicon nitride, which has high high-temperature strength, for the turbine wheel that gets hot and the rotating shaft that follows it, and also for the sliding surface with the cam. When a tappet made of ceramic is made of the metal/ceramic of the present invention, partially stabilized zirconia with high strength and high toughness is desirable as the ceramic material. Furthermore, when making a piston for an adiabatic engine whose piston crown is made of ceramic using the metal-ceramic composite of the present invention, partially stabilized zirconia, which has a thermal expansion coefficient close to that of cast iron constituting the piston body, is preferable as the ceramic material.

Example 1 Silicon nitride round bar made by pressureless sintering method with a diameter of 3.1 m
A ceramic member having a convex portion with a length of 20 Wl++n and a length of 20 Wl++n was produced. In addition, one end of an annealed chromium molybdenum steel (JIS-3CM485) round bar with an inner diameter of 3.
A metal member with a body diameter of 5 mjn was produced, which had four parts with a diameter of 0 mm and a depth of 25 ms and a threaded part at one end of the remaining part. The convex parts of the ceramic member are placed on the four parts of this metal member at a temperature of 20°C.
The shape shown in Figure 7 is that the gaps between the tips of the four parts of the metal member and the bottom of the convex part of the ceramic member (Figure 7C) are 0.2 mvr (combined body A) and 0 mvr (combined body B). A metal-ceramic composite was fabricated. When this metal/ceramic composite was placed in a heating furnace and the temperature was raised to 300°C, no abnormality was observed in composite A. However, the bonded body B broke at the R portion of the ceramic member at 200° C. during the temperature rise.

Example 2 Combined body A made in the same manner as Example 1 was heated to a pressure of 2 Torr.
, 530°C in a mixed atmosphere of 8 parts nitrogen and 2 parts hydrogen, 1
Ion nitriding treatment was performed for 0 hours.

Due to ion nitriding treatment, the surface hardness (Vickers hardness) of metal members increases from HV150 to HV before ion nitriding treatment (7)
Rising to 860 and 0.1611 from the surface
It showed HV 500 even at a depth of 1 m. Even after this ion nitriding treatment, no abnormality was observed in the press-fitted portion between the ceramic member and the metal member.

Example 8 Ceramic members having convex portions with diameters shown in Table 1 and a length of 20 cm were manufactured from nitrided silica pellets manufactured by pressureless sintering. Also, annealed aluminum OA model! J
Futen M (JIS-8AOM 645) A metal member was prepared by providing four parts of the diameter shown in Table 1 at one end of a round bar and a screw at the other end. The convex portions of the ceramic member were press-fitted into the four parts of this metal member under the conditions shown in Table 1 to produce a gold(16) metal/ceramic bonded body having the shape shown in No. 7. Using a jig as shown in Fig. 8, this metal-ceramic bonded body is placed in a heating furnace with the parts shown in Fig. 8 heated to the temperature shown in Table 1, and then pulled out in the vertical direction to form the joint. The load required for pulling out was measured. The results obtained are shown in Table 1.

In A1 and A2, the ceramic members were damaged at the R section in FIG. 7, so it is clear that the load (bonding force) required to pull out the joint is greater than the breaking load at the R section of the ceramic member.

As is clear from Table 1, the metal-ceramic composite of the present invention has a large bonding strength even at 800°C.

On the other hand, in comparative examples outside the scope of the present invention, the convex parts of the ceramic member cannot be press-fitted into the four parts of the metal member, or even if press-fitting is possible, only a weak bonding force can be obtained. I can't do it. Comparative Nanaiya 101N76108 has the hardness of the metal member, the thickness of the outer wall of the recess on the metal member,
Since the difference between the dimensions of the protrusion on the ceramic member and the dimensions of the four parts on the metal member were both larger than the scope of the present invention, the protrusion of the ceramic member was damaged during press-fitting.

Furthermore, Comparative Examples IG 104 and 105 are examples in which the pull-out test temperature is higher than the press-in temperature, and where the difference between the convex dimension of the ceramic member and the concave dimension of the metal member is smaller than the range of the present invention. However, in this case, the bonding force was weak and the bonded part came off under a low load (19). A ceramic member with a total length of 73 mm was fabricated integrally with silicon nitride according to the method.A convex portion with a diameter of 6 * O and a length of 17 mm was machined at the tip of the turbine shaft of this ceramic member. 9 diameter aluminium molybdenum
(JIS-SAOM 645) One end inner diameter 5.
8 reports, four parts with a depth of 19IIIn were formed. The convex part at the tip of the turbine shaft is press-fitted into these four parts at 850"C to create a turbo in which the turbine wheel and part of the turbine shaft are made of silicon nitride, and the distance between the end face of the four parts and the bottom of the convex part is 0.05+e+. A charger rotor was manufactured.The compressor wheel side rotating shaft of this turbocharger rotor was machined to have a diameter of 5 mm, giving it the shape shown in FIG.

This compressor wheel side rotating shaft 12 has an inner diameter of 5.2 mm.
Aluminum alloy (J
An inner cylinder made of IS-AO40) was fitted and fixed with a nut between the flange 17 and the screw 18 provided at one end of the rotating shaft on the compressor wheel side with a tightening torque of 15 and 9 cm. Put this turbocharger rotor into an electric furnace and
Although the temperature was raised to 00°C, no abnormality was observed in the press-fitted part between the ceramic and metal on the turbine shaft, the compressor shaft, and the threaded part.

Example 5 A turbocharger rotor having the shape shown in FIG. 3 was manufactured in the same manner as in Example 4. This turbocharger rotor was installed in a high-temperature rotation test equipment, and the combustion gas
A rotation test was conducted for 1 hour at 0.00 rpm, but no abnormality was observed.

Example 6 A disk having a diameter of 69 mm and a thickness of 3 W and having a convex portion of 15 holes in diameter and 15 holes in length at the center of the plate surface was prepared using partially stabilized zirconia ceramics containing 5.2% Y2O3. Also, made of spheroidal graphite cast iron, the outer diameter of the flange part is 85 m, the outer diameter of the body is 25 m, the inner diameter of the recess is 14.81 m, and the total length is 10 m1.
The metal member of a was produced. A convex portion of zirconia ceramics was press-fitted into the four parts of the metal member at 500° C. to produce a metal-ceramic bonded body.

On the other hand, in a part of the piston crown of a piston made of spheroidal graphite cast iron having a diameter of 7 Qam, a cavity consisting of a partially through hole into which this metal/ceramic composite could be inserted was provided. Next, the screw provided in the through hole and the screw on the metal member body of the metal-ceramic combination are fixed, and a part of the piston crown of the shape shown in FIG. 4 is made of partially stabilized zirconia ceramic, and the piston body is made of partially stabilized zirconia ceramic. A piston for an insulated engine made of spheroidal graphite cast iron was fabricated. This piston has a diameter of 7 Q.
mrn, stroke 75mm, rotation speed 220Orpm
No abnormalities were observed even after one hour of operation with this diesel engine.

As is clear from the above description, the metal-ceramic bonded body of the present invention is produced by forcibly applying a load to the convex portion provided on the ceramic member and the four portions provided on the gold 8 member having a smaller diameter than the convex portion diameter. At the same time, the metal of the present invention
At the operating temperature of the ceramic bonded body, a gap (22) is provided between the bottom surface of the convex part on the ceramic member and the end face of the four parts on the metal member, so that the ceramic member and the metal member fit together. The machining accuracy does not require the same high precision as in the case of shrink fitting, and there are no restrictions on the dimensions of the joined body. Furthermore, damage caused by the difference in coefficient of thermal expansion between the ceramic and metal of the press-fitted part can be prevented.

In particular, a turbocharger rotor with a structure in which a metal shaft is press-fitted into a ceramic turbine wheel and a subsequent ceramic shaft is a highly efficient turbocharger rotor because the turbine is made of ceramics that are lightweight and have excellent high-temperature strength. I can do it.

Further, a hollow space into which the metal-ceramic combined body of the present invention can be fitted is provided in the piston crown of the metal piston, and a screw provided in the hollow space and the metal member body of the metal-ceramic combined body of the present invention are provided. A piston for an insulated engine is made of ceramic, with a part of the piston crown that fixes the screw installed in the piston made of ceramic, and the piston body made of metal. Thermal insulation effect c2
8) It is also possible to make a high piston.

Further, the tappet can also be fitted with the metal-ceramic composite of the present invention so that the sliding surface with the cam can be made of ceramic, so that the tappet can have excellent wear resistance.

By using the metal-ceramic composite of the present invention itself or in combination with other metal members, the metal-ceramic composite of the present invention can improve the heat resistance, heat insulation, high-temperature strength, and wear resistance of ceramics. Turbocharger, piston, tappet, intake valve,
It can be used in engine parts such as exhaust valves, rocker arms, cams, and other structural parts that are subject to high temperatures and repeated loads.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams showing a longitudinal section of the structure of a specific example of the metal-ceramic composite of the present invention, and Figure 8 is a turbocharger as a specific application example of the metal-ceramic composite of the present invention. An explanatory diagram showing a vertical cross section of the press-fitting part of the rotor,
FIG. 4 is an explanatory diagram showing a cross section of a piston for an adiabatic engine, which is a specific example of using the metal-ceramic composite of the present invention in combination with other metal members, and FIGS. 5 and 6 show the metal of the present invention.・An explanatory diagram showing a cross section of a tappet which is another specific example in which a ceramic bonded body is used in combination with another metal member, and FIG. 7 is a cross section of the structure of another specific example of the metal/ceramic bonded body of the present invention. An explanatory diagram showing the metal
FIG. 1 is an explanatory diagram showing a method for performing a 1-output test on a ceramic bonded body. 1... Ceramic member, 2... Metal member, 2
Person... Screw 8... Four parts on a metal member, 4...
Convex portion on the ceramic member, 5... Gap between the end faces of the four parts and the bottom surface of the convex part, 6... End face of the concave part, 7.・・Bottom surface of the convex part,
8... Screw provided on the body of the metal member, 9... Flange, 11... Turbine wheel side rotating shaft, 12...
- Compressor wheel side rotating shaft, 18... Concave portion at the tip of the compressor wheel side rotating shaft, 14... Convex portion at the tip of the turbine wheel side rotating shaft, 15... Gap between the end face of the four parts and the bottom of the convex part, 16...・Turbine wheel, 17
...Flange, 18...Screw, 19...Piston crown, 19A...Screw, 20.28...Metal tappet, 2OA, 28A...Screw, 21...Sliding with cam Contact surface, 22... Bush rod contact surface, 81.
,・Pull rod, 82... Pulling knob. Patent Applicant Nippon Insulators Co., Ltd. 34 JP-A-50204 (9) Procedural Amendment June 14, 1980 1, Indication of Case 1982 Patent Application No. 158070 7, Contents of Amendment (as attached) 1. In the third to fourth lines of page 14 of the specification, "on a part of the metal piston" is corrected to "-R+(on) the piston crown of the metal piston 19." 2 , in line 8 of the same, "fixed piston" is corrected to "piston in a fixed place". 3, page 26 of the same, lines 19 to 20 [19... piston crown] is replaced with "IO... metal Corrected as manufactured piston J. (2) Procedural amendment August 1980 10 B 1982 patent Application No. 158070 Manufacturing method 3, person making the amendment Patent applicant? "Story (581) No. 2241 (Representative) " on the statement
Scope of Claims”1. Section 1 of "Detailed Description of the Invention", page 1, line 4 of the Mei MfI book, page 4, line 2 is corrected as follows. [2.Claim 1] A metal-ceramic bonded body in which a convex portion provided on a ceramic member is press-fitted into four portions or through holes provided in a metal member is provided with 1. A metal-ceramic bonded body, characterized in that the metal and ceramic members are bonded together such that a gap exists between the end face of the concave part of the made member and the bottom face of the convex part of the ceramic member. 2. The metal-ceramic bonded body according to claim 1, wherein seven rungs having a diameter larger than the diameter of the metal member body are formed in a part of the four side body parts of the metal member. . & Claim 1 or 2, wherein the ceramic member is a part of the rotating shaft of the turbocharger rotor on the turbine wheel side, and the metal member is a part of the rotating shaft of the turbocharger rotor on the compressor wheel side. The metal/ceramic composite described in any of the above. Table 1. The metal according to claim 8, wherein the ceramic member is silicon nitride, and the metal member is steel that can be surface hardened by any one of carburizing, nitriding, and surface hardening. Ceramic composite. 5. The metal-ceramic bonded body according to claim 1 or 2, wherein the ceramic member is a part of the piston crown, and the metal member is a part of the piston body. The metal-ceramic composite according to claim 5, wherein the ceramic member is partially stabilized zirconia and the metal member is cast iron. 7. In the method of integrally joining a metal member and a ceramic member, the diameter of the convex part provided on the ceramic part is 0.5% or more than the inner diameter of the four parts provided on the metal member.
5% larger, and the convex part is press-fitted into the concave part at a humidity below the annealing temperature of the metal member and at room temperature or above the maximum temperature to which the joint part is exposed during use. Method for producing conjugates. 8. In the method of integrally joining a metal member and a ceramic member, the diameter of the convex portion provided on the ceramic member is less than the inner diameter of the four portions provided on the metal member.
5% larger, and press-fit the convex part into the concave part at a temperature below the annealing temperature of the metal member and at room temperature or above the maximum operating temperature to which the joint part is exposed during use, and finish it to the specified dimensions after press-fitting. A method for producing a metal/ceramic (3) mixed composite body, characterized by hardening part or all of the surface of a metal member by carburizing, nitriding, surface hardening, or plating. 9. Claim 7, characterized in that the metal/ceramic combined body is a turbocharger rotor, the metal member is a metal rotating shaft on the compressor wheel side, and the ceramic member is a rotating shaft on the turbine wheel side. A method for producing a metal-ceramic bonded body according to any one of Items 1 and 8. (4) 2. Specification page 7, line 9, line 16, page 8, line 18,
Line 20, page 9, line 2, replace “0.05%” with [0.5%
Correct it as j. Representative patent attorney Akira Sugimura Hidegai 1 person

Claims (1)

[Claims] 1. A metal-ceramic bonded body in which a convex portion provided on a ceramic member is press-fitted into four portions or a through hole provided in a metal member, is made of metal at the operating temperature of the bonded body. A metal-ceramic bonded body, characterized in that the metal-ceramic bonded body is bonded such that a gap exists between the end face of the concave part of the member and the bottom face of the convex part of the ceramic member. 7. The metal-ceramic composite body according to claim 1, wherein seven rungs having a diameter larger than the diameter of the metal member body are formed in a part of the four side body parts of the metal member. . & Claim 1 or 2, wherein the ceramic member is a part of the rotating shaft of the turbocharger rotor on the turbine wheel side, and the metal member is a part of the rotating shaft of the turbocharger rotor on the compressor wheel side. The metal/ceramic composite described in any of the above. The metal according to claim 8, wherein the raw ceramic member is silicon nitride, and the gold M member is steel that can be surface hardened by any one of carburizing, nitriding, and surface hardening. , ceramic composite. 5. The metal-ceramic bonded body according to claim 1 or 2, wherein the ceramic member is a part of the piston crown, and the metal member is a part of the piston body. The metal-ceramic composite according to claim 5, wherein the ceramic member is partially stabilized zirconia and the metal member is cast iron. I. In a method of integrally joining a metal member and a ceramic member, the diameter of the convex portion provided on the ceramic member is 0.05% or more than the inner diameter of the recess provided on the metal member.
5% larger, and the convex part is press-fitted into the concave part at a humidity below the annealing humidity of the metal member and at room temperature or above the maximum temperature to which the joint part is exposed during use. How the body is manufactured. 8. In the method of integrally joining a metal member and a ceramic member, the diameter of the convex part provided on the ceramic member is 0.05% of the inner diameter of the four parts provided on the metal member.
~5% larger, and press-fit the convex part into the concave part at a temperature below the annealing temperature of the metal member and at room temperature or at a temperature above the maximum operating temperature to which the joint part is exposed during use, and after press-fitting, the convex part is pressed into the predetermined size. A method for producing a metal-ceramic bonded body, characterized by hardening part or all of the surface of a finished metal member by carburizing, nitriding, surface hardening, or plating. 9. Claim 7, characterized in that the metal/ceramic combined body is a turbocharger rotor, the metal member is a metal rotating shaft on the compressor wheel side, and the ceramic member is a rotating shaft on the turbine wheel side. A method for producing a metal-ceramic bonded body according to any one of Items 1 and 8.